Joseph v



(No Model.)

- J. V. NICHOLS.

ELECTRIC LAMP. No. 263,801. Patented Sept. 5, 1882.

U ITED STATES PATENT OFFICEa JOSEPH V. NICHOLS, OF BROOKLYN, ASSIGNOR TOTHE UNITED STATES ELECTRIC LIGHTING COMPANY, OF NEW YORK, N. Y.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 263,801, datedSeptember 5, 1882.

I Application filed February 6, 1882, (No model.)

To all whom it may concern Be it known that I, JosErH V. NIoHoLs, acitizen of the United States, and a resident of Brooklyn, in the countyof Kings and State of New York, have invented certain new and use fulImprovements in Electric Lamps, of which the following is aspecification.

My invention consists in an incandescent electric lamp involving in itsconstruction an open neck, a plug or stopper, and metal conductorspassing through the same, and arranged for the support of a conductor ofcarbon.

The main object of the invention is to produce a lamp in which thecarbon may be readily and cheaply renewed wheii destroyed, for whichpurpose I employ a plug or stopper, of rubber or similar material,through which the metal conductors are drawn, as hereinafter described,and form the globe with an open neck adapted for the reception of thesaid plug.

in the drawings, Figure 1 represents in elevation a lamp constructedaccording to my invention. Fig. 2 is a sectional view ofthe plug,illustrating the method of securing the metal conductors therein; Fig.3, a modified form of conductor.

The globe A is formed with an open and slightly-flaring neck, A, forwhich is prepared a plug or stopper of hard rubber or similar material,E. This latter is perforated for the reception of the conductors D,which are to be passed through it. In order to secure a tight jointbetween the conductors and the plug, the conductors are formed with ashoulder or enlargement, as shown in Fig. 3, or small adherent beads ofglass or vitreous cement, d d, are applied to them. The ends of theconductors are then forced through the perforations and the enlargementsor beads drawn up into the stopper, as shown.

The carbon B is then attached to the ends of the wires D in the usualmanner and the plug inserted in the open neck.

The lamp is exhausted through the sealing- 5 tube. As the air iswithdrawn the atmospheric pressure forces the plug tightly into the neckA and clamps, as it were, the substance of the plug around the wires D,and the enlargements or beads secured thereon. This prevents anydisplacement of the wires and insures a tight joint.

When by use the carbon becomes worn out the tip of the sealing-tube maybe broken and air admitted into the globe. The plug may then bewithdrawn, the globe cleaned, in case a deposithas been formed on itsinner surface, and a new carbon inserted.

Lamps thus constructed I have found to be both durable and efficient,and are made at a greatly reduced cost.

I am aware that rubber plugs have been employed with incandescent lamps,and this, therefore, I do not claim broadly; but

What I claim is-- 1. The combination of an exhausted globe or receiver,a stopper of rubber or similar material, and metallicsupporting-conductors having enlargements, as described, and passingthrough the stopper, substantially as set forth.

2. The combination of an exhausted globe or receiver, a stopper ofrubber or similar material,andmetallicsupporting-conductorshavingadherent beads of vitreous material, as described, and passingthrough the stopper, substantially as set forth.

In testimony whereof I have hereunto set my hand this 30th day ofJanuary, 1882.

JOSEPH V. NICHOLS.

Witnesses:

PARKER W, PAGE, W. FRIsBY.

